To solve this equation you need to first start by writing out the f(x)-g(X). The equation should be 2x^2-4x-5+2x. You then want to simplify the equation, I got 2x^2-2x-5. You then want to plug in the x=5 for all the x's in the equation. 2(5)^2-2(5)-5 would be the equation. The answer you get should be 35.